My situation. I stopped smoking March 19 after daily smoking for nearly 6 years. Around May 2 I thought I would be good with urine tests with internet bought clean urine. So I smoked daily again for 2 weeks. Then I found out my dream job wanted a hair test. Quest diagnostics hair test. I did the Macujo method for a week twice a day. I even paid 300 dollars to testclear for their Aloe Rid Shampoo. IT DID NOT WORK. I PUT THAT STUPID VINEGAR AND CLEAN AND CLEAR MIXTURE IN MY HAIR FOR A WEEK AND I FAILED. I was upset. I even used the Zydot ultra clean from testclear as well the day of the test. If you are a daily smoker and are getting a hair test, you will have to go for head shaving or just give it up. And to hell with test clear for charging 300 DOLLARS for that tube of nothing. Learn from my loss.